Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurement - Summary of Assumptions Used for Valuation of Fair Value Liabilities (Details)

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Fair Value Measurement - Summary of Assumptions Used for Valuation of Fair Value Liabilities (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Risk Free Interest Rate [Member] | Minimum [Member]        
Fair value assumptions, measurement input, percentages 2.39% 1.50% 1.62% 1.47%
Risk Free Interest Rate [Member] | Maximum [Member]        
Fair value assumptions, measurement input, percentages 2.63% 1.55% 2.63% 1.55%
Contractual Term (Years) [Member] | Minimum [Member]        
Fair value assumptions, measurement input, term 3 months 11 days 1 year 3 months 11 days 2 months 30 days 1 year 3 months 11 days
Contractual Term (Years) [Member] | Maximum [Member]        
Fair value assumptions, measurement input, term 3 years 5 years 3 years 2 months 30 days 5 years
Expected Volatility [Member] | Minimum [Member]        
Fair value assumptions, measurement input, percentages 131.00% 130.00% 113.00% 130.00%
Expected Volatility [Member] | Maximum [Member]        
Fair value assumptions, measurement input, percentages 171.00% 149.00% 171.00% 149.00%
Expected Dividend Yield [Member]        
Fair value assumptions, measurement input, percentages 0.00% 0.00% 0.00% 0.00%